A facile and green synthesis of CuO/NiO nanoparticles and their removal activity of toxic nitro compounds in aqueous medium
- Authors
- Ramu, A.G.; Kumari, M.L.A.; Elshikh, M.S.; Alkhamis, H.H.; Alrefaei, A.F.; Choi, D.
- Issue Date
- May-2021
- Publisher
- Elsevier Ltd
- Keywords
- Aminophenol; Catalytic reduction; Mixed metal oxide; Nitrophenol; Waste water
- Citation
- Chemosphere, v.271
- Journal Title
- Chemosphere
- Volume
- 271
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/16132
- DOI
- 10.1016/j.chemosphere.2020.129475
- ISSN
- 0045-6535
- Abstract
- In this present work, we report the green synthesis of mixed bimetal oxides (CuO/NiO) for the efficient reduction of toxic nitrophenols (NP, DNP and TNP) in aqueous medium. The CuO/NiO NPs were synthesized by green hydrothermal method combined calcination process. The physiochemical properties of the synthesized CuO/NiO NPs were systematically characterized by using XRD, XPS, FTIR, SEM, and HR-TEM techniques. The calcinated CuO/NiO NPs XRD pattern and SEM morphology show the high crystalline nature than the non-calcinated. Whereas, the XPS and FTIR results confirmed the formation of the metal oxide bonding and the interaction of the bimetals. The HR-TEM images showed the spherical crystals with average particle size about 25 nm. In addition, the SAED pattern confirmed the polycrystalline nature of CuO/NiO NPs. The catalytic reduction of nitro compounds to amino derivative was studied with reducing agent (NaBH4). The CuO/NiO NPs showed the high catalytic activity and completed the reduction reaction of NP, DNP and TNP with in 2, 5 and 10 min respectively. In addition, CuO/NiO NPS exhibited the excellent kinetic rate constant k value about 1.519, 0.5102, 0.4601 min?1 for NP, DNP and TNP respectively. Furthermore, the conversion product aminophenol was observed for these three nitro compounds. The proposed CuO/NiO NPs showed excellent crystal stability after the nitrophenol reduction reactions. An inexpensive CuO/NiO NPs is a promising catalysts for reduction of toxic nitro compounds to useful products in aqueous or non-aqueous medium. ? 2020 Elsevier Ltd
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